Tank cleaner

ABSTRACT

A PORTABLE HIGH PRESSURE TANK CLEANING APPARATUS WITH A LINEAR MOVABLE TUBULAR MEMBER THAT IS ALSO ROTATABLE AND ECCENTRICALLY ADJUSTABLE SECURED TO A BASE. A CLEANING HEAD IS LOCATED ON ONE OF THE LINEAR MOVABLE MEMBER. THE LINEAR MOVABILITY AND ROTATABLE ADJUSTABILITY OF THE MEMBER ON THE BASE PERMITS THE CLEANING HEAD TO BE POSITIONED AT DIFFERENT POSITIONS IN THE TANK.

June 26, 1973 Filed Aug. 12, 1970 L. F. STALKER TANK CLEANER 5Sheets-Sheet '1 INVENTOR. LEE F. STALKER ATTY.

I June 26, 1973 F STALKER 3,741,808

TANK CLEANER Filed Aug. 12, 1970 3 Sheets-Sheet z 4? [46 INVENTOR.

2 -49 I EE F. STALKE 4 ATTY.

' June 26, 1973 Filed Aug. 12, 1970 FIG.4

L. F. STALKER TANK CLEANER 3 Sheets-Sheet :5

INVENTOR. LEE F STALKER BYW Z ATTY.

United States Patent oace Patented June 26, 1973 3,741,808 TANK CLEANERLee F. Stalker, Louisville, Ky., assignor to The B. F. Goodrich Company,New York, N.Y. Filed Aug. 12, 1970, Ser. No. 63,106 Int. Cl. B05b 3/10;B08b 3/02, 9/08 US. Cl. 134-58 R 8 Claims ABSTRACT OF THE DISCLOSURE Aportable high pressure tank cleaning apparatus with a linear movabletubular member that is also rotatably and eccentrically adjustablysecured to a base. A cleaning head is located on one end of the linearmovable member. The linear movability and rotatable adjustability of themember on the base permits the cleaning head to be positioned atdifferent positions in the tank.

BACKGROUND OF THE INVENTION This invention relates to a high pressurecleaning apparatus and more particularly to a portable and adjustabletank cleaning apparatus that is linearly movable and laterally rotatableto position the cleaning head to different locations so that the headcan direct a high pressure stream of fluid against all interior surfacesof a chemical reactor vessel.

In the chemical processing industry large storage and processing tanksor vessels are utilized which must be periodically cleaned due tosurface Walls of such tanks becoming contaminated and fouled. Suchcontamination is caused by the mixing of the chemicals and the reactionoccurring in such tanks. In polymerization of polyvinyl chloride, forexample, cleaning of processing vessels is necessary after thecompletion of such batch polymerization process. In addition to theinterior surface walls of such tanks requiring cleaning, it is necessaryto clean the bafiles, crevices, agitators and agitator blades and thelike. Cleaning periodically is necessary so as to prevent contaminationof succeeding polymerization batches and to assure a consistent qualityproduct.

Cleaning of the interiors of such tanks has heretofore been accomplishedby manually scraping the interior walls, bafiles and agitator blades.Manual methods are time consuming and ineffective to thoroughly cleanthese many areas due to the inherent deficiencies of a manual operationand the difficulties encountered in reaching some areas with theadditional problem of subjecting the inner wall surfaces to scratchesand mars due to the use of scrapers. Hand lances utilizing high pressurenozzles have been used to supplement the hand scraping to clean theinteriors of tanks; however, an operator using a hand lance isessentially still a manual operator, wherein the operator maneuvers thelance, which maneuvering is rendered diflicult by the length of suchlances and the inaccessibility from the exterior thereof. Operating ahand lance outside the vessel makes it impossible to reach all interiorsurf-aces within the vessel. A hand lance invariably creates a fog whichfurther hampers the operator from observing the interior of the tank.Hand lances are further difiicult to maneuver and, due to the highpressure system, create an ever-present danger to operating personnel.Numerous safety procedures are necessary with manual operations, such aslocking out the agitator motor and panel switch to render the agitatorsinoperable, connecting an exhaust hose to the tanks prior to cleaningand exhausting the interior thereof for at least twenty minutes toassure that the toxic fumes therein are all exhausted, since such fumesare heavier than air, locking various valves and engaging safety alarmsfor the sole purpose of protecting operators working within and aroundthe vessel. The operator has difficulty climbing into the tank requiringconsiderable effort and maneuvering. Accordingly, such manual cleaningmethods employed are time consuming, cumbersome, dangerous, a healthhazard and are further inadequate for providing the necessary cleansurfaces within the vessels. Efforts to mechanize the clean ing of tanksby cleaning apparatus was ineffective due to inability to handle andmaneuver these cleaning apparatuses because of their overall large sizeand the limited availability of overhead space in the processing plantscompared to the size of tanks being cleaned. These and otherdisadvantages are no longer encountered in practicing this invention.

The advantages realized with this invention are numer ous. A manualcleaning operation is eliminated which avoids occupational hazards,health hazards and further eliminates inherent deficiencies of handoperations such as fatigue and carelessness. A portable cleaningapparatus with nozzles is inserted into the tank and programmed for theseveral desired positions within the tank and operates without operatormanipulations, which apparatus effectively cleans all interior surfacesand is further easily manipulated into and out of the tank. Suchoperation is done pneumatically to eliminate fire hazards. The apparatusis a compact unit employing novel gear reducing means to provide abalanced unit.

SUMMARY OF THE INVENTION In accordance with this invention, a portablehigh pressure cleaning apparatus has a carrier member whose forwardportion supports a cleaning head for rotative and longitudinal movementautomatically by a programmed means through the several cleaningpositions for rapidly and effectively cleaning the entire Wall surfaces,the apparatus within the vessel, as well as the baffles and agitatorblades. The high pressure nozzles on the extreme end of the cleaningapparatus are driven through a hollow shaft with gear means keyedthereto such that the rotating nozzles revolved through a predeterminedgeometric pattern for directing high pressure sprays to all surfaceswithin the tank effectively cleaning the interior of the tank.

To clearly illustrate this invention, reference will henceforth be madeto the embodiment of this invention shown in the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation view of acleaning apparatus within a tank, showing the tank in cross section.

FIG. 2 is a plan view of the invention shown in FIG. 1;

FIG. 3 is an enlarged fragmentary view of the lower portion of thecleaning apparatus showing the drive means and nozzles;

FIG. 4 is a schematic drawing of the control system and cleaningapparatus with the drum shown in a flattened developed view; and

FIG. 5 is a perspective view of a hinged mast clamp.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawings, whereinlike reference characters designate like or corresponding partsthroughout the several views, there is shown a tank or vessel 10 whichreceives the jet-cleaning apparatus to be described. The upper portionof vessel 10 has a circular flange 11 defining a manhole 12 for entryinto vessel 10. The portable cleaning apparatus includes a support base13 which is suitably secured to the flange 11 as by suitable bolts 14.Support base 13 connected thereto. The lower annular surface of thesupport base 13 which is attached to circular flange 11 defines a firstplanar surface designated AA, while the mating surfaces of annular platemembers and 16 define a second planar surface which intersects planarsurface AA.

Referring to the BIG. 1, upper plate member 16 is recessed along itslower inner periphery to define a recess which cooperates with a recesson the upper inner periphery of lower plate member 15 to define anannular guideway 18 which receives an annular flange 20 of a tubularsupport or tubular support means 21. Suitably pivotally mounted to thesupport base 13 is a lower air cylinder 22 having its rod end 23pivotally secured to a bracket 24. A bracket 25 (FIG. 2), suitablyfastened to plate member 16, pivotally supports the head end ofpneumatic cylinder 26. The rod 27 of pneumatic cylinder 26 is pivotallysecured as by clevis 28- to the upper end portion of tubular support 21.

A tubular member or hollow carrier member 30 is inserted through tubularsupport 21 for rotative movement and longitudinal movement relativethereto. Member 30 may be keyed to tubular support 21 if desired. Theupper end portion of tubular member or carrier member 30 has a threadedunion 31 for connection to suitable flexible hose, not shown, which maybe connected to a suitable source of fluid or water under pressure.Tubular member 30 has a central bore 32 (FIG. 2) that extendslongitudinally therethrough for connecting the hollow threaded union 31with a bore 33 in housing 34. Housing 34 has journaled therein forrotation a tubular shaft 35 which suitably communicates with passageway33. Tubular shaft 35 is also journaled for rotation in the housing ofgear reducer unit 36, which gear reducer unit 36 is secured via brackets37 to housing 34. Secured to gear reducer unit 36 is a transmissionmeans 38 which has mounted thereon air motive means 39. Motive means 39drives through transmission 38 a worm 40, which in turn drives hollowworm gear 41, which gear 41 is keyed to shaft 35 for rotation therewith.The lower end portion of shaft 35 is connected to a rotary union 42which rotates therewith. A bevel gear 43 is journaled on rotary union 42for relative rotation thereon but for movement therewith. Bevel gear 43meshes with stationary bevel gear 44 which is secured by rods 45 to thehousing or gear reducer unit 36. Mounted for rotation with bevel gear 43is a nozzle head assembly 46 with a pair of nozzles 4748 connected viapassageways 49 with rotary union 42 and the bore 50 of tubular shaft 35.

Air motor 39 receives pressurized air via a conduit 51, which conduit 51is connected via suitable passageway not shown that extends throughtubular member 30, which in turn is connected to conduit 52, which inturn is connected to a suitable air pressure source whereby motor 39 isenergized. Shown in FIG. 4 is a drum 55, which drum is layed out in aflattened developed condition. The drum 55 rotates on a shaft 56, whichhas keyed to it a one-way clutch 57 supporting a spur gear 58. Spur gear58 meshes with a rack 60 that is connected to the rod end 61 of a piston62 located within cylinder 63. Actuation of cylinder 63 indexes drum 55one increment, with such drum being adapted to be indexed 9 times in theexample shown for a complete revolution and with additional spacesprovided toassure additional controls positions if desired. Therespective rows of the drum are in alignment with a plurality of valvesV1 through V7, which valves are either manually operable, as by leverarms a through g, or by cams (A through V) which are positioned upon therotatable drum 55. Such valves V1 through V7 are two positions, directoperated spool-poppet valves spring returned to normal position. Thecams are press fitted onto the selected positions of the drum to givethe desired sequence of operation, such that as the drum 55 rotates, thecams selectively engage the downwardly projecting stern thereof. Apressure source 65 is connected via control valve 66 and manifold 67 tothe respective valve V1 through V7. In the normal positions of thevalves, V1 connects the head end of cylinder 63 via conduit 68 toexhaust, valve V2 connects a whistle 70 via conduit 71 to ex haust,valve V3 connects the head end of cylinder 22, via conduit 72 toexhaust, valve V4 connects the rod end of cylinder 22 via conduit 73 toexhaust, valve V5 conmeets the rod end of cylinder 26 via conduit 74 toexhaust, valve V6 connects the head end of cylinder 26 via conduit 75 toexhaust, valve V7 connects the lower chamber of a control valve orpneumatic timing relay 76 through accumulator T-l via conduit 77 throughan annular groove in spool 78 to exhaust. Control valve or pneumatictiming relay 76 is a commercially available relay on the open market,and the one shown is manufactured by Agastat Division, 1027 Newark Ave,Elizabeth, NJ. 07208. Briefly, the application of pres sure at controlport 79 actuates motor diaphragm 81, compressing recycle spring 82 andallowing the timing spring 83 to exert pressure on the timing diaphragm84. The timing diaphragm compresses the air thereabove in chamber 85which forces air through the restricted variable control orifice 86 asit passes into chamber 87. As the air is exhausted from the timingchamber 85, a spindle 89 follows the movement of the timing diaphragm84. At the end of a preset delay period, the spindle 89 actuates spring90 into its second position shown in phantom lines causing a snap actiontransfer of the spool 78 to an upper position which connects conduit 91from valve V7 to conduit 92, which actuates cylinder 63 as to bedescribed. The snap action movement of spring 90 also removes the inputpressure to the chamber 80 served by control port 79 allowing therecycle spring 90 to reset the motor diaphragm 81, causing the spindle89 to reset the output spool 78, and refills the timing chamber 85through the check valve '93. Spool 78 shown in the position disclosed inFIG. 4 connects chamber 80 to exhaust, but upon actuation of valve V7 bycams S, T, U or V will provide pressurized air from source 65 to conduit91, thence via conduit 77 to the chamber 80 to condition such controlvalve or timing relay 76 for a snap action described above to send apulse of pressurized air from source 65 via conduits 91 and 92 tocylinder 63 which indexes the drum 55 one step. This is accomplishedsince spool 78 is moved gpwardly to connect conduit 91 to conduit 92 viagroove To secure and retain the tubular member 30 in its raisedposition, a cylindrical mast clamp 96 having two hinged sections asshown in FIG. 5 is placed around the tubular member 30 such that itsupper portion abuttingly engages a flange 97 secured to member 30 andwith its lower end portion abuttingly engaging the upper end portion oftubular support 21. With such clamp 96 encircling tubular member 30, therod end of cylinder 22 need not be pressurized until the cleaningapparatus is positioned within the reactor tank to be cleaned.

In the initial operation the cleaning head is held in the retractedposition as disclosed by FIG. 1 as by clamp 96 which keeps tubularmember 30 fixed relative to tubular support 21 even though no pressureis in the rod end of cylinder 22 which permits the operator to positionthe cleaning apparatus within the tank. Upon securing the cleaningapparatus to the manhole and clamping it into position, the operatorthen manually depresses valve V1, which action moves the spool valve V1in an upwardly direction, connecting the pressure source via manifold 67to conduit 68 for pressurizing the head end of cylinder 63 which indexesthe drum 55 via rack 60 to its first position, wherein cam G actuatesvalve V4 which connects the pressurized source via manifold 67 andconduit 73 to lower end portion of cylinder 22 which assures that thetubular member 30 is in the uppermost position, thereby relieving thepressure upon the clamp 96, thereby permitting the operator to removesuch clamp. The operator then manually depresses valve V1, whichpressurizes the head end of cylinder 63 which indexes the drum to itssecond position.

In the second position of the drum, cams B and K respectively actuatevalves V3 and V5, while deactuating valve V4 such that the pressurizedair from the rod end of cylinder 22 is connected to exhaust whilepressurized air from source 65 moves via manifold 67 and conduit 72 topressurize the head end of pneumatic cylinder 22 which moves tubularmember 30 downwardly to its lowermost :position, while valve V5 connectsthe pressurized source with cylinder 26 to pivot the lowermost endportion of the cleaning apparatus to the left (to the position indicatednumber 1 in FIG. 2). The operator then hooks up the fluid supply hose,not shown, to the upper end portion of tubular member 30 and theoperation is now automatically controlled. The operation is begun by theoperator depressing valve V1, which indexes the drum 55 to the thirdposition, since the pressurized source actuates cylinder 63 via manifold67 and conduit 68 such that cams C, L and S actuate valves V3, V5 and V7respectively. Actuation of valve V3 continues to maintain pressurizedair at the head end of pneumatic cylinder 22, while valve V5 maintainspressurized air on the left hand portion of control cylinder 26 asviewed in FIG. 4. Actuation of valve V7 by cam S, connects thepressurized source to conduit 91 which directs the pressurized air to anaccumulator T l, via conduit 77, which in turn provides a time delay andpressurizes chamber 80, the lower portion of control valve 76, whichmoves motor diaphragm 81 in an upwardly direction to compress spring 82.Essentially, control valve 76 is a time delay switch such that the airlocated in timing chamber 85 is forced through valve 86 to theintermediate chamber 87. Such exchange of air continues untilsubstantially all of the air accumulated in chamber 85 is transferred tochamber 87, which thereby continues to move valve stem or spindle 89 inan upwardly direction as seen in FIG. 4, until the pin 98 actuatesspring 90 which snaps into its upper position which is a downwardlyextending concave arc and moves spool 78 to its second position, wherebythe air from accumulator tank T-1 flows via conduit 77 to exhaust whilea pressurized pulse is sent via conduits 91 and 92 to cylinder 63 whichin turn indexes, via rack 60 and one-way clutch 57, drum 55 to itsfourth position which thereby brings cams H, M and T into operativepositions which actuate valves V4, V5 and V7 respectively. Valve V4actuated by cam H directs pressurized air from manifold 67 to the lowerportion of control cylinder 22 via conduit 73 which retracts tubularmember 30, along with the cleaning head to the uppermost position, whilevalve V5 maintains the control cylinder 26 in its previously conditionedmanner which thereby maintains the cleaning head in the left handportion of the tank, which in FIG. 2 is position number 2. The valve V7is again actuated, which via conduit 91, pressurized tank T-1, which inturn directs pressurized fluid to the lower portion of control valve 76exhausting the air out of timing chamber 85 and transferring suchpressurized air to chamber 87. It is to be recalled that the air inchamber 87 returns to chamber 85 via check valve 93 rapidly and controlvalve 76 is repositioned in the position shown in FIG. 4 instantly, suchthat actuation of valve V7 in position 4 is such as to condition controlvalve 76 for a second sequence of time delay, as above described. Oncompletion of the cycle, spindle 89 will again be actuated to its secondposition, whereby tank T-1 is vented to atmosphere and cylinder 63 isactuated to index the drum 55. In this position the drum 55 is moved toposition 5, whereby valves V4, V6 and V7 are actuated which moves thecleaning apparatus head to the position number 3, as indicated in FIG.2. Upon comand V, which moves the cleaning head to position number 4.Upon completion of this operation, cylinder 63 is actuated such as toindex the drum 55 to its seventh position by cams A, E and P, wherebyvalves V2, V3 and V6 are actuated wherein valve V2 connects thepressurized source, via manifold 67 and conduit 71 to the whistle 70,indicating the completion of the operation. The operator then issignaled that the automatic cycle has been completed, whereby he mayanytime thereafter depress lever a on valve V1 which connects thepressurized source via conduit 68 to pressurize the head end of cylinder63, which indexes the drum to its eighth position, which disconnects thewhistle from the operation and the operator manually depresses lever aof valve V1 which thence indexes the drum to its final position suchthat cams J and R actuate valves V4 and V6 which in turn retracts thecleaning head to its uppermost position by connecting the pressurizedsource to the rod end of cylinder 22 and the head end of cylinder 26,permitting the operator to position the mast clamp 96 about the upperend of tubular member 30 and permits him to disconnect the air hose 52and water hose, not shown, from the cleaning apparatus and to removesuch cleaning apparatus from the tank.

What is claimed is:

1. A portable tank cleaning apparatus comprising: a base for attachmentto a manhole of a tank; said base having an annular guideway and a lowerflat annular surface; said base having a bore therethrough; said borehaving a central axis that is normal to a plane passing through saidlower flat annular surface; a tubular support means journaled forrotative movement about a longitudinal axis that is noncoincident withand intersects said central axis of said bore of said base; a tubularmember supported by said support means for axial movement therethroughand rotation therewith; first poweroperated means interconnecting saidtubular support means and said base for rotative adjustment movement ofsaid tubular support means relative to said base; second power-operatedmeans operatively connected to said tubular member to move said tubularmember axially relative to said tubular support means into differentpositions relative to said base in said tan-k; spray nozzle meansmounted on one end of said tubular member for rotation thereon; saidtubular member having a passageway means for connection to said spraynozzle for delivering high pressure fluid to said spray nozzle means;gear means mounted on said tubular member interconnected with said spraynozzle means; motive drive means connected to said gear means and saidspray nozzle means for rotating said spray nozzle means about a pair ofaxes to :provide a changing pattern of movement for cleaning theinterior of a tank.

2. A portable tank cleaning apparatus as set forth in claim 1 whereinprogramming means are operatively connected to said first and secondpower operated means to control their actuations thereof to provide forthe multipositioning of said spray nozzle means in said tank.

3. A portable tank cleaning apparatus as set forth in claim 2 whereinsaid programming means includes an indexable drum with cams thereonoperative to control the extension and retraction of said power-operatedmeans.

4. A portable tank cleaning apparatus comprising: a support base forattachment to a tank; said support base having a lower annular surfacefor abutting contact to the manhole of a tank; said annular surfacedefines a first planar surface; said support base having an annularguideway spaced from said annular surface; a tubular support meansmounted in said supportbase; said tubular support means having a flangerotatably received by said guideway; said flange having an upper flatsurface defining a second planar surface which upon extension intersectssaid first planar surface; power-operated means connected to saidtubular support means for moving said tubular support means relative tosaid base; a tubular member journaled in said support means for rotativemovement therewith and axial movement relative thereto; jet nozzle meanssecured to said tubular member for movement therewith; motive drivemeans connected to said nozzle means for rotating said nozzle meansabout a pair of perpendicular intersecting axes; said tubular memberhaving a passageway means connected to said nozzle means for deliveringhigh pressure fluid thereto; poweroperated means connected to saidtubular member for moving said tubular member axially relative to saidsupport base for positioning said tubular member into differentpositions in said tank.

5. A portable tank cleaning apparatus as set forth in claim 4 whereincontrol means are operatively connected to said power operated means forsequential timed operation thereof to control the positioning, theextension and retraction of the nozzle means in a predeterminedsequence.

6. A portable tank cleaning apparatus as set forth in claim 5 whereinsaid control means includes an indexable drum; a pneumatically operatedvalve operated by said indexable drum to provide said predeterminedsequence of operation.

7. A portable tank cleaning apparatus comprising: a support base forattachment to a manhole of a tank; said support base having a lowerannular surface for abutment to the surrounding surface of a manhole ofa tank; said annular surface defines a first planar surface; saidsupport base having an annular guideway spaced from said annular surfaceand skewed relative thereto; a tubular support means having a flange;said flange rotatably received by said guideway; a tubular memberjournaled in said tubular support means for rotative and axial movementrelative thereto; first power operated means connected to said tubularsupport means for rotating said tubular support means on said supportbase between selected positions by extension and retraction of saidpower operated means; a cleaning head secured to said tubular member formovement therewith; passageway means ex tending through said tubularmember; transmission means mounted on said tubular member; saidtransmission means having an output means operatively connected to saidcleaning head; motive drive means mounted on said transmission means forimparting power thereto to rotate said cleaning head about a pair ofperpendicular axes to effect a changing pattern of movement; secondpower operated means connected to said tubular member for moving saidtubular member axially for extending and retracting said tubular memberrelative to said support base by extension and retraction of said secondpower operated means; and means for controlling the extension andretraction of said power operated means in a predetermined sequence toprovide for the multi-positioning of said cleaning head in the tank.

8. A portable tank washing assembly comprising: a base for attachment tothe manhole of a tank; a tubular support eccentrically mounted on saidbase; said base having a central opening therein with a center linetherethrough; said tubular support extending through said opening; theaxis of said tubular support having its axis of rotation intersectingbut non-colinear with the axis of said central opening; said axis ofsaid tubular support defining a cone upon rotation of said tubularsupport on said base; a tubular member mounted on said tubular supportfor rotatable adjustment and axial movement relative therein; one end ofsaid tubular member having inlet means for attachment to a high pressurecleaning fluid source; a cleaning head assembly mounted on the other endof said tubular member; said cleaning head having a pair of nozzle meansfor dispersing cleaning fluid therefrom; said pair of nozzle meanssupported for rotation about a pair of perpendicular axes; one of saidaxes being colinear with the longitudinal center line of said tubularmember; first power operated means interconnecting said tubular supportand said base, operative upon actuation to rotate said tubular supportrelative to said base to selectively position said cleaning headassembly into different locations in a tank; second power operated meansinterconnecting said tubular member and said base, operative uponactuation to move said tubular movement axially relative to said tubularsupport to extend or retract said cleaning head relative to said base;and motive drive means mounted on said tubular member operativelyconnected to said nozzle means for rotating said pair of nozzle meansabout said pair of axes; and control means operatively connected to saidfirst and second power operated means for sequentially actuating saidfirst and second power operated means in timed relationship.

References Cited UNITED STATES PATENTS 3,472,451 10/1969 Orem et al134-167 R X 2,109,075 2/1938 Ruth 134-167 R X 2,116,935 5/1938 Richardet al. 134-167 R X 3,444,869 5/1969 Guignon et al 134-167 R 3,599,8718/1971 Ruppel et al 239-227 FOREIGN PATENTS 307,719 1/ 1969 Sweden134-167 ROBERT L. BLEUTGE, Primary Examiner US. Cl. X.R.

L I UNITED STATES PATENT OFFICE} CERTIFICATE OF coRREcTIoN Patent No.13,741, 808 Dated 6/26/73 Inventofler) Lee Stalker It is certified thaterror appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:

In Column 6, line &6, after "nozzle" insert --means--'.

In Column 8, line 28', change "movement" to -member--.-

Signed and sealed this 5th day of November 1974.

(SEAL) Atteat C. MARSHALL DANN McCOY M. GIBSON JR. Attesting OfficerCommissioner of Patents USCOMM-DC 60376-P69 W U.$4 GOVERNMENT PRINTINGOFFICE 2 "l9 0-366-334 FOQM PO-105O (10-69)

